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Risk Return Abstract rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName JOHN HANCOCK INVESTMENT TRUST
Prospectus Date rr_ProspectusDate Mar. 01, 2025
Class A C I R2 R4 R6 | John Hancock Disciplined Value International Fund  
Risk Return Abstract rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading <span style="color:#000000;font-family:Arial Narrow;font-size:24pt;">John Hancock Disciplined Value International Fund</span>
Objective [Heading] rr_ObjectiveHeading <span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-weight:bold;">Investment objective</span>
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock To seek long-term capital growth.
Expense [Heading] rr_ExpenseHeading <span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-weight:bold;">Fees and expenses</span>
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock This table describes the fees and expenses you may pay if you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts on Class A shares if you and your family invest, or agree to invest in the future, at least $50,000 in the John Hancock family of funds.Intermediaries may have different policies and procedures regarding the availability of front-end sales charge waivers or contingent deferred sales charge (CDSC) waivers (See Appendix 1 - Intermediary sales charge waivers, which includes information about specific sales charge waivers applicable to the intermediaries identified therein). More information about these and other discounts is available from your financial professional and beginning on page 24 of the prospectus under “Sales charge reductions and waivers” or page 122 of the fund’s Statement of Additional Information under “Sales Charges on Class A and Class C Shares.”
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption <span style="color:#000000;font-family:Arial Narrow;font-size:8pt;font-weight:bold;margin-left:0.0pt;">Shareholder fees (%) </span><span style="color:#000000;font-family:Arial Narrow;font-size:8pt;margin-left:0.0pt;">(fees paid directly from your investment)</span>
Operating Expenses Caption [Text] rr_OperatingExpensesCaption <span style="font-family:Arial Narrow;font-size:8pt;font-weight:bold;margin-left:0.0pt;">Annual fund operating expenses (%) </span><span style="font-family:Arial Narrow;font-size:8pt;margin-left:0.0pt;">(expenses that you pay each year as a percentage of </span><span style="font-family:Arial Narrow;font-size:8pt;margin-left:0.0pt;">the value of your investment)</span>
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination <span style="font-family:Arial Narrow;font-size:8pt;">July 31, 2026</span><span style="font-family:Arial Narrow;font-size:8pt;">February 28, 2026</span>
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading <span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-weight:bold;">Portfolio turnover</span>
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund’s performance. During its most recent fiscal year, the fund’s portfolio turnover rate was 91% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 91.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts <span style="color:#000000;font-family:Arial Narrow;font-size:9pt;">You may qualify for sales </span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;">charge discounts on Class A shares if you and your family invest, or agree to invest in the future, at least $</span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;">50,000</span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;"> in the John Hancock family of funds.</span>
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent <span style="font-family:Arial Narrow;font-size:8pt;">“Management fee” has been restated to reflect the contractual management fee schedule effective December 12, 2024.</span>
Expense Example [Heading] rr_ExpenseExampleHeading <span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-weight:bold;">Expense example</span>
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. Please see below a hypothetical example showing the expenses of a $10,000 investment for the time periods indicated and then, except as shown below, assuming you sell all of your shares at the end of those periods. The example assumes a 5% average annual return and that fund expenses will not change over the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption <span style="font-family:Arial Narrow;font-size:8pt;font-weight:bold;">Shares Sold</span>
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption <span style="font-family:Arial Narrow;font-size:8pt;font-weight:bold;">Shares</span><span style="font-family:Arial Narrow;font-size:8pt;font-weight:bold;">Not Sold</span>
Strategy [Heading] rr_StrategyHeading <span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-weight:bold;">Principal investment strategies</span>
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The fund pursues its investment objective by investing, under normal circumstances, at least 80% of its net assets (plus any borrowings for investment purposes) in a portfolio of equity and equity-related securities issued by non-U.S. companies of any capitalization size. The fund may invest in all types of equity and equity-related securities, including, without limitation, exchange-traded and over-the-counter common and preferred stocks, warrants, options, rights, convertible securities, sponsored and unsponsored depositary receipts and shares, trust certificates, participatory notes, limited partnership interests, shares of other investment companies (including exchange-traded funds (ETFs)), real estate investment trusts (REITs), and equity participations. Equity participations are loans that give the lender a portion of equity ownership in a property, in addition to principal and interest payments. A convertible security is a bond, debenture, note, preferred stock, or other security that may be converted into or exchanged for a prescribed amount of common stock of the same or a different issuer within a particular period of time at a specified price or formula. The fund defines non-U.S. companies as companies: (i) that are organized under the laws of a foreign country; (ii) whose principal trading market is in a foreign country; or (iii) that have a majority of their assets, or that derive a significant portion of their revenue or profits, from businesses, investments, or sales outside of the United States. The fund’s non-U.S. investments, which may be denominated in U.S. or foreign currencies, primarily focus on developed markets, but may include emerging- and frontier-market investments. The fund generally invests in the equity securities of issuers the manager believes are undervalued. The manager applies a bottom-up stock selection process using a combination of fundamental and quantitative analysis of issuer-specific factors such as price-to-book value, price-to-sales and earnings ratios, dividend yields, strength of management, and cash flow. The fund may invest in derivatives. Derivatives may be used to reduce risk, obtain efficient market exposure, and/or enhance investment returns, and may include put and call options, futures, forward contracts, and swaps. The fund may invest up to 15% of its net assets in illiquid securities and may participate as a purchaser in Initial Public Offerings (IPOs). The fund may also seek to increase its income by lending portfolio securities.
Risk [Heading] rr_RiskHeading <span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-weight:bold;">Principal risks</span>
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading <span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-weight:bold;">Past performance</span>
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following information illustrates the variability of the fund’s returns and provides some indication of the risks of investing in the fund by showing changes in the fund’s performance from year to year and by showing how the fund’s average annual returns compared with a broad-based securities market index. Past performance (before and after taxes) does not indicate future results. All figures assume dividend reinvestment. Performance information is updated daily, monthly, and quarterly and may be obtained at our website, jhinvestments.com, or by calling 800-225-5291 (Class A and Class C), Monday to Thursday, 8:00 a.m.—7:00 p.m., and Friday, 8:00 a.m.—6:00 p.m., Eastern time, or 888-972-8696 (Class I, Class R2, Class R4, and Class R6) between 8:30 a.m. and 5:00 p.m., Eastern time, on most business days.Please note that after-tax returns (shown for Class A shares only) reflect the highest individual federal marginal income-tax rate in effect as of the date provided and do not reflect any state or local taxes. Your actual after-tax returns may be different. After-tax returns are not relevant to shares held in an IRA, 401(k), or other tax-advantaged investment plan. After-tax returns for other share classes would vary.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns <span style="font-family:Arial Narrow;font-size:9pt;">The following information illustrates the variability of the fund’s returns and provides some indication of the risks of investing in the fund by showing changes in the fund’s performance from year to year and by showing how the fund’s average annual returns compared with a broad-based securities market index.</span>
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone <span style="font-family:Arial Narrow;font-size:9pt;">800-225-5291 (Class A and </span><span style="font-family:Arial Narrow;font-size:9pt;">Class C), Monday to Thursday, 8:00</span><span style="font-family:Arial Narrow;font-size:9pt;line-height:12pt;"> </span><span style="font-family:Arial Narrow;font-size:9pt;font-variant:small-caps;">a.m.</span><span style="font-family:Arial Narrow;font-size:9pt;">—7:00</span><span style="font-family:Arial Narrow;font-size:9pt;line-height:12pt;"> </span><span style="font-family:Arial Narrow;font-size:9pt;font-variant:small-caps;">p.m.</span><span style="font-family:Arial Narrow;font-size:9pt;">, and Friday, 8:00</span><span style="font-family:Arial Narrow;font-size:9pt;line-height:12pt;"> </span><span style="font-family:Arial Narrow;font-size:9pt;font-variant:small-caps;">a.m.</span><span style="font-family:Arial Narrow;font-size:9pt;">—6:00</span><span style="font-family:Arial Narrow;font-size:9pt;line-height:12pt;"> </span><span style="font-family:Arial Narrow;font-size:9pt;font-variant:small-caps;">p.m.</span><span style="font-family:Arial Narrow;font-size:9pt;">, Eastern time, or 888-972-8696 (Class I, Class R2, Class R4, and Class R6) between 8:30</span><span style="font-family:Arial Narrow;font-size:9pt;line-height:12pt;"> </span><span style="font-family:Arial Narrow;font-size:9pt;font-variant:small-caps;">a.m.</span><span style="font-family:Arial Narrow;font-size:9pt;"> and 5:00</span><span style="font-family:Arial Narrow;font-size:9pt;line-height:12pt;"> </span><span style="font-family:Arial Narrow;font-size:9pt;font-variant:small-caps;">p.m.</span><span style="font-family:Arial Narrow;font-size:9pt;">, Eastern time, on most business days.</span>
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress <span style="font-family:Arial Narrow;font-size:9pt;">jhinvestments.com</span>
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture <span style="font-family:Arial Narrow;font-size:9pt;"> Past performance (before and after taxes) does not indicate future results.</span>
Bar Chart [Heading] rr_BarChartHeading <span style="font-family:Arial Narrow;font-size:9pt;font-weight:bold;">Calendar year total returns (%)—Class A </span><span style="font-family:Arial Narrow;font-size:9pt;">(</span><span style="font-family:Arial Narrow;font-size:9pt;">sales charges are not reflected in the bar chart and returns would have been lower if they were</span><span style="font-family:Arial Narrow;font-size:9pt;">)</span>
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads <span style="font-family:Arial Narrow;font-size:9pt;">sales charges are not reflected in the bar chart and returns would have been lower if they were</span>
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock Best quarter:Q4 202220.37%Worst quarter:Q1 2020-26.84%
Performance Table Heading rr_PerformanceTableHeading <span style="font-family:Arial Narrow;font-size:8pt;font-weight:bold;margin-left:0.0pt;">Average annual total returns (%)—as of 12/31/2024</span>
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate <span style="color:#000000;font-family:Arial Narrow;font-size:9pt;">Please note that after-tax returns (shown for Class A shares only)</span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;"> reflect the highest individual federal marginal income-tax rate in effect as of the date </span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;">provided and do not reflect any state or local taxes.</span>
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred <span style="color:#000000;font-family:Arial Narrow;font-size:9pt;"> Your actual after-tax returns may be different. After-tax returns are not relevant to shares held in an </span><span style="color:#000000;font-family:Arial Narrow;font-size:9pt;">IRA, 401(k), or other tax-advantaged investment plan.</span>
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown <span style="color:#000000;font-family:Arial Narrow;font-size:9pt;">Please note that after-tax returns (shown for Class A shares only)</span>
Class A C I R2 R4 R6 | John Hancock Disciplined Value International Fund | Risk Lose Money [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Many factors affect performance, and fund shares will fluctuate in price, meaning you could lose money.
Class A C I R2 R4 R6 | John Hancock Disciplined Value International Fund | Risk Not Insured Depository Institution [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock An investment in the fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Class A C I R2 R4 R6 | John Hancock Disciplined Value International Fund | Credit And Counterparty Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Credit and counterparty risk.  The counterparty to an over-the-counter derivatives contract or a borrower of fund securities may not make timely payments or otherwise honor its obligations.
Class A C I R2 R4 R6 | John Hancock Disciplined Value International Fund | Economic And Market Events Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Economic and market events risk.  Events in the U.S. and global financial markets, including actions taken by the U.S. Federal Reserve or foreign central banks to stimulate or stabilize economic growth, may at times result in unusually high market volatility, which could negatively impact performance. Reduced liquidity in credit and fixed-income markets could adversely affect issuers worldwide. Banks and financial services companies could suffer losses if interest rates rise or economic conditions deteriorate.
Class A C I R2 R4 R6 | John Hancock Disciplined Value International Fund | Equity Securities Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Equity securities risk.  The price of equity securities may decline due to changes in a company’s financial condition or overall market conditions. Securities the manager believes are undervalued may never realize their full potential value, and in certain markets value stocks may underperform the market as a whole.
Class A C I R2 R4 R6 | John Hancock Disciplined Value International Fund | Exchange Traded Funds Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Exchange-traded funds (ETFs) risk.  The risks of owning shares of an ETF include the risks of owning the underlying securities the ETF holds. Lack of liquidity in an ETF could result in the ETF being more volatile than its underlying securities. An ETF’s shares could trade at a significant premium or discount to its net asset value (NAV). A fund bears ETF fees and expenses indirectly.
Class A C I R2 R4 R6 | John Hancock Disciplined Value International Fund | Foreign Securities Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Foreign securities risk.  Less information may be publicly available regarding foreign issuers, including foreign government issuers. Foreign securities may be subject to foreign taxes and may be more volatile than U.S. securities. Currency fluctuations and political and economic developments may adversely impact the value of foreign securities. The risks of investing in foreign securities are magnified in emerging markets. Depositary receipts are subject to most of the risks associated with investing in foreign securities directly because the value of a depositary receipt is dependent upon the market price of the underlying foreign equity security. Depositary receipts are also subject to liquidity risk.
Class A C I R2 R4 R6 | John Hancock Disciplined Value International Fund | Frontier Market Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Frontier-market risk.  Frontier-market countries generally have smaller economies and less-developed capital markets and political systems than traditional emerging-market countries, which magnifies emerging-market risks.
Class A C I R2 R4 R6 | John Hancock Disciplined Value International Fund | Hedging Derivatives And Other Strategic Transactions Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Hedging, derivatives, and other strategic transactions risk.  Hedging, derivatives, and other strategic transactions may increase a fund’s volatility and could produce disproportionate losses, potentially more than the fund’s principal investment. Risks of these transactions are different from and possibly greater than risks of investing directly in securities and other traditional instruments. Under certain market conditions, derivatives could become harder to value or sell and may become subject to liquidity risk (i.e., the inability to enter into closing transactions). Derivatives and other strategic transactions that the fund intends to utilize include: foreign currency forward contracts, futures contracts, options, and swaps. Foreign currency forward contracts, futures contracts, options, and swaps generally are subject to counterparty risk. In addition, swaps may be subject to interest-rate and settlement risk, and the risk of default of the underlying reference obligation. Derivatives associated with foreign currency transactions are subject to currency risk.
Class A C I R2 R4 R6 | John Hancock Disciplined Value International Fund | Illiquid And Restricted Securities Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Illiquid and restricted securities risk.  Illiquid and restricted securities may be difficult to value and may involve greater risks than liquid securities. Illiquidity may have an adverse impact on a particular security’s market price and the fund’s ability to sell the security.
Class A C I R2 R4 R6 | John Hancock Disciplined Value International Fund | Initial Public Offerings Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Initial public offerings (IPOs) risk.  IPO share prices are frequently volatile and may significantly impact fund performance.
Class A C I R2 R4 R6 | John Hancock Disciplined Value International Fund | Investment Company Securities Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Investment company securities risk.  Fund shareholders indirectly bear their proportionate share of the expenses of any investment company in which the fund invests. The total return on such investments will be reduced by the operating expenses and fees of such other investment companies, including advisory fees.
Class A C I R2 R4 R6 | John Hancock Disciplined Value International Fund | Large Company Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Large company risk.  Larger companies may grow more slowly than smaller companies or be slower to respond to business developments. Large-capitalization securities may underperform the market as a whole.
Class A C I R2 R4 R6 | John Hancock Disciplined Value International Fund | Liquidity Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Liquidity risk.  The extent (if at all) to which a security may be sold or a derivative position closed without negatively impacting its market value may be impaired by reduced market activity or participation, legal restrictions, or other economic and market impediments.
Class A C I R2 R4 R6 | John Hancock Disciplined Value International Fund | Master Limited Partnership Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Master limited partnership (MLP) risk.  MLPs generally reflect the risks associated with their underlying assets and with pooled investment vehicles. MLPs with credit-related holdings are subject to interest-rate risk and risk of default.
Class A C I R2 R4 R6 | John Hancock Disciplined Value International Fund | Operational And Cybersecurity Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Operational and cybersecurity risk.  Cybersecurity breaches may allow an unauthorized party to gain access to fund assets, customer data, or proprietary information, or cause a fund or its service providers to suffer data corruption or lose operational functionality. Similar incidents affecting issuers of a fund’s securities may negatively impact performance. Operational risk may arise from human error, error by third parties, communication errors, or technology failures, among other causes.
Class A C I R2 R4 R6 | John Hancock Disciplined Value International Fund | Participatory Notes Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Participatory notes risk.  Participatory notes (p-notes) represent interests in securities listed on certain foreign exchanges. Due to transaction costs and other expenses, p-notes will not replicate exactly the performance of their underlying securities. P-notes are general unsecured contractual obligations of the financial institutions issuing the notes and are subject to liquidity risk and a high degree of counterparty risk.
Class A C I R2 R4 R6 | John Hancock Disciplined Value International Fund | Preferred And Convertible Securities Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Preferred and convertible securities risk.  Preferred stock dividends are payable only if declared by the issuer’s board. Preferred stock may be subject to redemption provisions. The market values of convertible securities tend to fall as interest rates rise and rise as interest rates fall. Convertible preferred stock’s value can depend heavily upon the underlying common stock’s value.
Class A C I R2 R4 R6 | John Hancock Disciplined Value International Fund | Real Estate Investment Trust Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Real estate investment trust (REIT) risk.  REITs, pooled investment vehicles that typically invest in real estate directly or in loans collateralized by real estate, carry risks associated with owning real estate, including the potential for a decline in value due to economic or market conditions.
Class A C I R2 R4 R6 | John Hancock Disciplined Value International Fund | Small And Mid Sized Company Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Small and mid-sized company risk.  Small and mid-sized companies are generally less established and may be more volatile than larger companies. Small and/or mid-capitalization securities may underperform the market as a whole.
Class A C I R2 R4 R6 | John Hancock Disciplined Value International Fund | Value Investment Style Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Value investment style risk.  Value securities may underperform the market as a whole, which may cause value-oriented funds to underperform equity funds with other investment strategies. Securities the manager believes are undervalued may never perform as expected.
Class A C I R2 R4 R6 | John Hancock Disciplined Value International Fund | Warrants Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Warrants risk.  The prices of warrants may not precisely reflect the prices of their underlying securities. Warrant holders do not receive dividends or have voting or credit rights. A warrant ceases to have value if not exercised prior to its expiration date.
Class A C I R2 R4 R6 | John Hancock Disciplined Value International Fund | Class A  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum front-end sales charge (load) on purchases, as a % of purchase price rr_MaximumCumulativeSalesChargeOverOfferingPrice 5.00%
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is less rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Small account fee (for fund account balances under $1,000) ($) rr_MaximumAccountFee $ 20
Management fee rr_ManagementFeesOverAssets 0.68% [1]
Distribution and service (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Service plan fee rr_Component1OtherExpensesOverAssets none
Additional other expenses rr_Component2OtherExpensesOverAssets 0.19%
Total other expenses rr_OtherExpensesOverAssets 0.19%
Total annual fund operating expenses rr_ExpensesOverAssets 1.12%
Contractual expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.01%) [2]
Total annual fund operating expenses after expense reimbursements rr_NetExpensesOverAssets 1.11%
1 year rr_ExpenseExampleYear01 $ 608
3 years rr_ExpenseExampleYear03 837
5 years rr_ExpenseExampleYear05 1,085
10 years rr_ExpenseExampleYear10 $ 1,794
2015 rr_AnnualReturn2015 1.50%
2016 rr_AnnualReturn2016 (0.60%)
2017 rr_AnnualReturn2017 24.88%
2018 rr_AnnualReturn2018 (18.88%)
2019 rr_AnnualReturn2019 15.06%
2020 rr_AnnualReturn2020 4.53%
2021 rr_AnnualReturn2021 12.62%
2022 rr_AnnualReturn2022 (5.22%)
2023 rr_AnnualReturn2023 18.87%
2024 rr_AnnualReturn2024 (0.58%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel <span style="color:#000000;font-family:Arial Narrow;font-size:8pt;font-weight:bold;margin-left:0.0pt;">Best quarter:</span>
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2022
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 20.37%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel <span style="color:#000000;font-family:Arial Narrow;font-size:8pt;font-weight:bold;margin-left:0.0pt;">Worst quarter:</span>
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (26.84%)
1 year rr_AverageAnnualReturnYear01 (5.52%)
5 year rr_AverageAnnualReturnYear05 4.61%
10 year rr_AverageAnnualReturnYear10 3.95%
Class A C I R2 R4 R6 | John Hancock Disciplined Value International Fund | Class C  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum front-end sales charge (load) on purchases, as a % of purchase price rr_MaximumCumulativeSalesChargeOverOfferingPrice none
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is less rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Small account fee (for fund account balances under $1,000) ($) rr_MaximumAccountFee $ 20
Management fee rr_ManagementFeesOverAssets 0.68% [1]
Distribution and service (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Service plan fee rr_Component1OtherExpensesOverAssets none
Additional other expenses rr_Component2OtherExpensesOverAssets 0.19%
Total other expenses rr_OtherExpensesOverAssets 0.19%
Total annual fund operating expenses rr_ExpensesOverAssets 1.87%
Contractual expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.01%) [2]
Total annual fund operating expenses after expense reimbursements rr_NetExpensesOverAssets 1.86%
1 year rr_ExpenseExampleYear01 $ 289
3 years rr_ExpenseExampleYear03 587
5 years rr_ExpenseExampleYear05 1,010
10 years rr_ExpenseExampleYear10 1,994
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 189
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 587
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,010
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,994
1 year rr_AverageAnnualReturnYear01 (2.26%)
5 year rr_AverageAnnualReturnYear05 4.88%
10 year rr_AverageAnnualReturnYear10 3.72%
Class A C I R2 R4 R6 | John Hancock Disciplined Value International Fund | Class I  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum front-end sales charge (load) on purchases, as a % of purchase price rr_MaximumCumulativeSalesChargeOverOfferingPrice none
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is less rr_MaximumDeferredSalesChargeOverOfferingPrice none
Small account fee (for fund account balances under $1,000) ($) rr_MaximumAccountFee none
Management fee rr_ManagementFeesOverAssets 0.68% [1]
Distribution and service (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Service plan fee rr_Component1OtherExpensesOverAssets none
Additional other expenses rr_Component2OtherExpensesOverAssets 0.19%
Total other expenses rr_OtherExpensesOverAssets 0.19%
Total annual fund operating expenses rr_ExpensesOverAssets 0.87%
Contractual expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.01%) [2]
Total annual fund operating expenses after expense reimbursements rr_NetExpensesOverAssets 0.86%
1 year rr_ExpenseExampleYear01 $ 88
3 years rr_ExpenseExampleYear03 277
5 years rr_ExpenseExampleYear05 481
10 years rr_ExpenseExampleYear10 $ 1,072
1 year rr_AverageAnnualReturnYear01 (0.30%)
5 year rr_AverageAnnualReturnYear05 5.94%
10 year rr_AverageAnnualReturnYear10 4.78%
Class A C I R2 R4 R6 | John Hancock Disciplined Value International Fund | Class R2  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum front-end sales charge (load) on purchases, as a % of purchase price rr_MaximumCumulativeSalesChargeOverOfferingPrice none
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is less rr_MaximumDeferredSalesChargeOverOfferingPrice none
Small account fee (for fund account balances under $1,000) ($) rr_MaximumAccountFee none
Management fee rr_ManagementFeesOverAssets 0.68% [1]
Distribution and service (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Service plan fee rr_Component1OtherExpensesOverAssets 0.25%
Additional other expenses rr_Component2OtherExpensesOverAssets 0.07%
Total other expenses rr_OtherExpensesOverAssets 0.32%
Total annual fund operating expenses rr_ExpensesOverAssets 1.25%
Contractual expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.01%) [2]
Total annual fund operating expenses after expense reimbursements rr_NetExpensesOverAssets 1.24%
1 year rr_ExpenseExampleYear01 $ 126
3 years rr_ExpenseExampleYear03 396
5 years rr_ExpenseExampleYear05 685
10 years rr_ExpenseExampleYear10 $ 1,510
1 year rr_AverageAnnualReturnYear01 (0.78%)
5 year rr_AverageAnnualReturnYear05 5.56%
10 year rr_AverageAnnualReturnYear10 4.39%
Class A C I R2 R4 R6 | John Hancock Disciplined Value International Fund | Class R4  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum front-end sales charge (load) on purchases, as a % of purchase price rr_MaximumCumulativeSalesChargeOverOfferingPrice none
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is less rr_MaximumDeferredSalesChargeOverOfferingPrice none
Small account fee (for fund account balances under $1,000) ($) rr_MaximumAccountFee none
Management fee rr_ManagementFeesOverAssets 0.68% [1]
Distribution and service (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Service plan fee rr_Component1OtherExpensesOverAssets 0.10%
Additional other expenses rr_Component2OtherExpensesOverAssets 0.07%
Total other expenses rr_OtherExpensesOverAssets 0.17%
Total annual fund operating expenses rr_ExpensesOverAssets 1.10%
Contractual expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.11%) [2],[3]
Total annual fund operating expenses after expense reimbursements rr_NetExpensesOverAssets 0.99%
1 year rr_ExpenseExampleYear01 $ 101
3 years rr_ExpenseExampleYear03 339
5 years rr_ExpenseExampleYear05 596
10 years rr_ExpenseExampleYear10 $ 1,330
1 year rr_AverageAnnualReturnYear01 (0.52%)
5 year rr_AverageAnnualReturnYear05 5.80%
10 year rr_AverageAnnualReturnYear10 4.64%
Class A C I R2 R4 R6 | John Hancock Disciplined Value International Fund | Class R6  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum front-end sales charge (load) on purchases, as a % of purchase price rr_MaximumCumulativeSalesChargeOverOfferingPrice none
Maximum deferred sales charge (load) as a % of purchase or sale price, whichever is less rr_MaximumDeferredSalesChargeOverOfferingPrice none
Small account fee (for fund account balances under $1,000) ($) rr_MaximumAccountFee none
Management fee rr_ManagementFeesOverAssets 0.68% [1]
Distribution and service (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Service plan fee rr_Component1OtherExpensesOverAssets none
Additional other expenses rr_Component2OtherExpensesOverAssets 0.07%
Total other expenses rr_OtherExpensesOverAssets 0.07%
Total annual fund operating expenses rr_ExpensesOverAssets 0.75%
Contractual expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.01%) [2]
Total annual fund operating expenses after expense reimbursements rr_NetExpensesOverAssets 0.74%
1 year rr_ExpenseExampleYear01 $ 76
3 years rr_ExpenseExampleYear03 239
5 years rr_ExpenseExampleYear05 416
10 years rr_ExpenseExampleYear10 $ 929
1 year rr_AverageAnnualReturnYear01 (0.25%)
5 year rr_AverageAnnualReturnYear05 6.06%
10 year rr_AverageAnnualReturnYear10 4.88%
Class A C I R2 R4 R6 | John Hancock Disciplined Value International Fund | Return After Taxes on Distributions | Class A  
Risk Return Abstract rr_RiskReturnAbstract  
1 year rr_AverageAnnualReturnYear01 (7.74%)
5 year rr_AverageAnnualReturnYear05 3.57%
10 year rr_AverageAnnualReturnYear10 3.23%
Class A C I R2 R4 R6 | John Hancock Disciplined Value International Fund | Return After Taxes on Distributions and Sale of Shares | Class A  
Risk Return Abstract rr_RiskReturnAbstract  
1 year rr_AverageAnnualReturnYear01 (1.50%)
5 year rr_AverageAnnualReturnYear05 3.67%
10 year rr_AverageAnnualReturnYear10 3.17%
Class A C I R2 R4 R6 | John Hancock Disciplined Value International Fund | MSCI EAFE Index (reflects no deduction for fees, expenses, or taxes, except foreign withholding taxes on dividends)  
Risk Return Abstract rr_RiskReturnAbstract  
1 year rr_AverageAnnualReturnYear01 3.82%
5 year rr_AverageAnnualReturnYear05 4.73%
10 year rr_AverageAnnualReturnYear10 5.20%
[1] “Management fee” has been restated to reflect the contractual management fee schedule effective December 12, 2024.
[2] The advisor contractually agrees to waive a portion of its management fee and/or reimburse expenses for the fund and certain other John Hancock funds according to an asset level breakpoint schedule that is based on the aggregate net assets of all the funds participating in the waiver or reimbursement, including the fund (the participating portfolios). This waiver equals, on an annualized basis, 0.0100% of that portion of the aggregate net assets of all the participating portfolios that exceeds $75 billion but is less than or equal to $125 billion; 0.0125% of that portion of the aggregate net assets of all the participating portfolios that exceeds $125 billion but is less than or equal to $150 billion; 0.0150% of that portion of the aggregate net assets of all the participating portfolios that exceeds $150 billion but is less than or equal to $175 billion; 0.0175% of that portion of the aggregate net assets of all the participating portfolios that exceeds $175 billion but is less than or equal to $200 billion; 0.0200% of that portion of the aggregate net assets of all the participating portfolios that exceeds $200 billion but is less than or equal to $225 billion; and 0.0225% of that portion of the aggregate net assets of all the participating portfolios that exceeds $225 billion. The amount of the reimbursement is calculated daily and allocated among all the participating portfolios in proportion to the daily net assets of each participating portfolio. During its most recent fiscal year, the fund’s reimbursement amounted to 0.01% of the fund’s average daily net assets. This agreement expires on July 31, 2026, unless renewed by mutual agreement of the fund and the advisor based upon a determination that this is appropriate under the circumstances at that time.
[3] The distributor contractually agrees to limit its Rule 12b-1 fees for Class R4 shares to 0.15%. This agreement expires on February 28, 2026, unless renewed by mutual agreement of the fund and the distributor based upon a determination that this is appropriate under the circumstances at that time.